1. Intensive Care and; Department of Pediatric Surgery; Erasmus Medical Center-Sophia Children's Hospital; Rotterdam The Netherlands
2. Department of Orthopedics, Section of Physical Therapy; Erasmus Medical Center-Sophia Children's Hospital; Rotterdam The Netherlands
3. Department of Pediatrics, Division of Pediatric Respiratory Medicine; Erasmus Medical Center-Sophia Children's Hospital; Rotterdam The Netherlands
4. Department of Biostatistics; Erasmus Medical Center; Rotterdam The Netherlands